dumping Apache Tika Metadata ?

[GoogleCodeExporter]

Hi, 

First, THANKS a lot for your project. Being able to manipulate yaml from Java 
in so valuable.

I would like to discuss about something which is not an issue I think, but 
still cannot solve it... I have to use with org.apache.tika.metadta.Metadata 
(http://tika.apache.org/0.7/api/org/apache/tika/metadata/Metadata.html).
I think these metadata could be nicely dumped to or loaded from yaml, for tests 
or maybe end user editions in our case.

But this class is not a JavaBean, so trying to dump it produces a YAMLException 
org.yaml.snakeyaml.error.YAMLException: No JavaBean properties found in 
org.apache.tika.metadata.Metadata. Is there a way to "Represent" it a nice way?

Thanks for any tip, and sorry as it's not directly linked to yaml.
jg

What version of the product are you using?
yaml-1.7

Original issue reported on code.google.com by jgrand...@gmail.com on 16 Nov 2010 at 5:34

[GoogleCodeExporter]

From the Metadata.java it looks like BeanAccess.FIELD might work for you. 
For dumping and for loading since there is nothing special done in setters.

But it was brief look ;) So you better try yourself.

Yaml.setBeanAccess(BeanAccess.FIELD)

-alex 

Original comment by alexande...@gmail.com on 16 Nov 2010 at 7:18

[GoogleCodeExporter]

Thank you very much Alex, 
I tried your tip, and it works well for a simple example. Here's the test:

Yaml y = new org.yaml.snakeyaml.Yaml()
y.setBeanAccess(org.yaml.snakeyaml.introspector.BeanAccess.FIELD)

Metadata met = new Metadata();
met.set("met1", "whatever")
met.set("met2", "something")
met.add("met2", "something else");

y.dump(m)
!!org.apache.tika.metadata.Metadata
metadata:
  met1: [whatever]
  met2: [something, something else]

But I still have to learn how to properly load it!!
y.load(FileInputStream(File("metadata.yml")))
Exception in thread "main" java.lang.ClassCastException: java.util.ArrayList 
cannot be cast to [Ljava.lang.String;

Thanks again, 
Regards
jg

Original comment by jgrand...@gmail.com on 16 Nov 2010 at 8:37

[GoogleCodeExporter]

This issue was updated by revision 191ab72b39.

GenericProperty.class fails to identify type when Collection's parameter is an 
Array.
Workaround: use TypeDespriptor to specify correct PropertyType

Original comment by alexande...@gmail.com on 16 Nov 2010 at 12:28

[GoogleCodeExporter]

This issue was closed by revision fa3b0e3d2a.

Original comment by alexande...@gmail.com on 16 Nov 2010 at 12:28

• Changed state: Fixed

[GoogleCodeExporter]

It should work now. You can use either latest sources or something like this 
with 1.7:

TypeDescription aTypeDescr = new TypeDescription(Metadata.class);
aTypeDescr.putMapPropertyType("meta", String.class, String[].class);

Constructor c = new Constructor();
c.addTypeDescription(aTypeDescr);
Yaml yaml2load = new Yaml(c);
yaml2load.setBeanAccess(BeanAccess.FIELD);

yaml2load.load(....)

See http://code.google.com/p/snakeyaml/wiki/Documentation#Type_safe_collections

Original comment by alexande...@gmail.com on 16 Nov 2010 at 12:34

[GoogleCodeExporter]

You can also try the latest snapshot:
https://oss.sonatype.org/content/groups/public/org/yaml/snakeyaml/

Original comment by py4fun@gmail.com on 16 Nov 2010 at 1:49

[GoogleCodeExporter]

Please be aware that you do not have to use global tags (with the class name). 
You can find an example in the tests (testNoTags):
http://code.google.com/p/snakeyaml/source/browse/src/test/java/org/yaml/snakeyam
l/issues/issue95/ArrayInGenericCollectionTest.java

Original comment by py4fun@gmail.com on 16 Nov 2010 at 3:10